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→Soil Characterization Testing
Greening Rooftops for Sustainable Communities, held in Baltimore, MD from April 30 to May 2, 2008. http://admin.ipps.org/uploads/58_086.pdf</ref>. </small>
Greening Rooftops for Sustainable Communities, held in Baltimore, MD from April 30 to May 2, 2008. http://admin.ipps.org/uploads/58_086.pdf</ref>. </small>
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|<sup>ix</sup> <small>Based on Penn State University Center for Green Roof Research (Berghage et al. 2008) for the minimum to sustain plant growth and Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA, 2014) for the maximum to avoid unnecessary fertilization that would have low or no effect on plant health. </small>
|<sup>ix</sup> <small>Based on Penn State University Center for Green Roof Research (Berghage et al. 2008)<ref name="example5" />. for the minimum to sustain plant growth and Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA, 2014) for the maximum to avoid unnecessary fertilization that would have low or no effect on plant health. </small>
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